How to Choose a Suitable Pen

1. Buy a wooden pencil. 

Regular pencils are familiar. Many people have used them at school or around the house. They're common and the use of different grades of lead allows you to learn about the rating scale and how the change in lead affects your style.
Beginners who want to start with a single pencil can experiment with an intermediate-grade lead pencil.
Buying specific lead grade pencils gives you the opportunity to specifically choose what you need to achieve the desired effect.

2. Buy a mechanical pencil.

These pencils do come in a variety of lead grades, but not as many as regular pencils. The reason for this is that the mechanical action can only handle thin, dark lead. The ease of pushing a button to feed lead to the tip makes this a good choice for beginners.The pencil keeps one grade of lead at a time, which promotes learning consistency and control with that particular pencil.
These are the cheapest pencils available, found in art supply stores or online, along with lead packs to refill them. They're durable and come in a variety of designs.
Mechanical pencils that use lead with a .5 millimeter diameter are very versatile. Smaller thickness pencils are useful for detailed drawing, and larger thickness is good for rough sketches.
Due to only using one grade of lead, these pencils can leave you with less of a range in shades, making your work appear darker.

3. Try a clutch (lead holder) pencil.

These are specialized pencils used by artists and are a combination of regular and mechanical pencils. Compared to regular pencils, they have a larger variety of lead diameters, but also use the lead dispensing system of mechanical pencils.
The most common lead diameter size is 2 mm and can be used for drafting. Thicker lead is used for sketching and thinner lead is used for drafting.
Varieties of these pencils are hard to find at art supply shops. Regular and mechanical pencils are more specialized and popular.

4. Start using charcoal pencils.

Pencils now come made in a wide variety of substances that can give the ambitious different results in drawing. One of these, charcoal, is known for its dark color and popular for its versatility. Charcoal is good for new artists because it provides the ability to make different types of lines with minimal effort.

Charcoal pencils follow the European scale, but the lead is soft. Charcoal pencils range from lead grades H and HB to 6B.
The pencils can be bought individually and in sets for minimal cost. Besides the traditional black color, you can find sepia tones and white.

5. Try out carbon pencils. 

These are a mixture of clay, black pigment, and charcoal or graphite, allowing them to have the darkness of charcoal and the smoothness of pencils. This means they make soft black lines smoothly and consistently.

Carbon pencils are soft and therefore come in a range of lead grade B to 6B.